Journal of Textile Research ›› 2020, Vol. 41 ›› Issue (05): 85-93.doi: 10.13475/j.fzxb.20190804409

• Dyeing and Finishing & Chemicals • Previous Articles     Next Articles

Role of sodium sulfate in low add-on pad-cure-steam reactive dyeing process

WU Wei1,2, CHEN Xiaowen1,2, ZHONG Yi1,2,3, XU Hong1,2,3, MAO Zhiping1,2,3,4()   

  1. 1. Key Laboratory of Science and Technology of Eco-Textile, Ministry of Education, Donghua University, Shanghai 201620, China
    2. College of Chemistry, Chemical Engineering and Biotechnology, Donghua University, Shanghai 201620, China
    3. Innovation Center for Textile Science and Technology, Donghua University, Shanghai 201620, China
    4. Shanghai ANOKY Group Co., Ltd., Shanghai 201799, China
  • Received:2019-08-14 Revised:2020-01-20 Online:2020-05-15 Published:2020-06-02
  • Contact: MAO Zhiping E-mail:zhpmao@dhu.edu.cn

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Abstract:

Aiming to explain the reasons that the dyeing performance became better after adding sodium sulfate in the low add-on pad-cure-steam reactive dyeing process, a model of dyeing solution layers on the surface of cellulose fibers were created. The water evaporation, dye and ion distribution in the systems during curing process with or without sodium sulfate were studied by means of molecular dynamics simulations. By calculating the number densities and radial distribution functions, the results show that sodium sulfate has a water retention effect in the process of low add-on pad-cure-steam reactive dyeing. After the alkali treatment, the hydroxyl groups on the cellulose sugar rings become oxygen negative ions, which make the effect of water retention becomes more obvious. The main reason for the water retention effect is that the addition of sodium sulfate produces stable and directional multi-potential layers: cellulose oxygen anion-sodium ion-sulfate ion-sodium ion. Such multi-potential layers can effectively lock moisture on the surface of the fiber, provide a better reaction environment for the dye and the fiber, and prevent desorption, migration and hydrolyzation of the dye with the water molecules at high temperature.

Key words: reactive dye, sodium sulfate, low add-on, molecular dynamics simulation, water retention

CLC Number: 

  • O647.9

Fig.1

Schematic diagram of simulation system"

Tab.1

Parameter settings of simulation systems"

体系
编号		 纤维
模型		 硫酸钠
质量浓度/
(g·L-1)		 钠离子
个数		 硫酸根
离子个数		 水分子
个数		 碱化
纤维素
糖环个数
Ⅰ 纤维素 0 15 0 7 423 —
Ⅱ 晶体 60 141 63 7 104 —
Ⅲ 表面碱化 0 159 0 7 423 144
Ⅳ 纤维素晶体 60 285 63 7 104 144

Tab.2

Comparison of dyeing performances with or without sodium sulfate"

体系 K/S平均值 色差 固色率平均值/%
无硫酸钠 5.362 2.555 5 74.55
有硫酸钠 8.045 1.216 9 86.45

Fig.2

Changes of water molecules number on surface of (alkalized-)cellulose crystal in different systems with time"

Fig.3

Changes of average number density distributions of water molecules during different time periods in different systems. (a) System I; (b) System II; (c) System III; (d) System IV"

Fig.4

Changes of average number density distributions of sodium during different time periods in different systems. (a) System I; (b) System II; (c) System III; (d) System IV"

Fig.5

Changes of average number density distributions of sulfate ions during different time periods. (a) System II; (b) System IV"

Fig.6

Schematic diagram of multi-potential layers in system IV"

Fig.7

RDFs of water molecules around sodium ions in different time periods and systems. (a) System I; (b) System II; (c) System III; (d) System IV"

Fig.8

RDFs of water molecules around sulfate ions in different time periods. (a) System II; (b) System IV"

Fig.9

RDFs of water molecules around terminal sulphur atom of vinyl sulfone sulfate group in different time periods and systems. (a) System I; (b) System II; (c) System III; (d) System IV"

Fig.10

RDFs of sodium ions around terminal sulphur atom of vinyl sulfone sulfate group in different time periods and systems. (a) System I, (b) System II; (c) System III; (d) System IV"

Fig.11

CNs of sodium ions around terminal sulphur atom of vinyl sulfone sulfate group in different time periods and systems. (a) System I; (b) System II; (c) System III; (d) System IV"

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